Differential amplifier
a technology of amplifiers and amplifiers, applied in the direction of differential amplifiers, amplifiers with semiconductor devices/discharge tubes, amplifiers, etc., can solve the problems of switching noise dependent on input voltage, switching noise is transferred to output, etc., and achieves the effect of reducing the effect of noise and high speed
Active Publication Date: 2009-04-28
SEMICON COMPONENTS IND LLC
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Benefits of technology
The present invention provides a differential amplifier that can reduce the effect of noise and operate at high speed. It includes a differential transistor pair, a current source, a bias circuit, self-bias switches, and an external bias switch. The structural components can be combined in different ways to achieve the desired performance.
Problems solved by technology
Then a problem arises where this switching noise is transferred to an output by way of the parasitic capacitance.
Method used
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Embodiment Construction
[0022]The invention will now be described based on preferred embodiments which do not intend to limit the scope of the present invention but exemplify the invention. All of the features and the combinations thereof described in the embodiment are not necessarily essential to the invention.
[0023]A differential amplifier according to one embodiment of the present invention comprises: a differential transistor pair; at least one current source connected to the differential transistor pair; a bias circuit which supplies a bias voltage to the current source and which controls current generated by the current source; a first self-bias switch and a second self-bias switch each provided between an input terminal and an output terminal of each of transistors that constitute the differential transistor pair; and an external bias switch provided on a path of bias voltage supplied from the bias circuit to the current source.
[0024]According to this embodiment, the bias state of the differential ...
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Connected to a differential transistor pair are a load current source and a tail current source. A bias circuit controls current generated by the load current source. A first self-bias switch is provided between a gate and a drain of a first input transistor; and a second self-bias switch is provided between a gate and a drain of a second input transistor, where the first input transistor and the second input transistor constitute the differential transistors pair. An external bias switch is provided between the bias circuit and the load current source.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2006-266815, filed on Sep. 29, 2006, and Japanese Patent Application No. 2007-202287, filed on Aug. 2, 2007, the entire contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a differential amplifier that amplifies or compares an inputted voltage.[0004]2. Description of the Related Art[0005]In recent years, along with the progress in a digital processing technology of video signals there is a growing demand of high performance in an analog-to-digital converter circuit (hereinafter referred to as “A / D converter” also) used in the video signal processing. As an A / D converter that meets this demand, an A / D converter of a pipeline type has been utilized.[0006]The pipeline type A / D converter is configured by including a sub-A / D converter...
Claims
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IPC IPC(8): H03F3/45
CPCH03F1/26H03F3/45183H03F3/45475H03M1/0881H03F2200/372H03F2203/45508H03F2203/45534H03F2203/45726H03M1/167
Inventor KOBAYASHI, SHIGETOWADA, ATSUSHI
Owner SEMICON COMPONENTS IND LLC